Insulator



March 27, 1934. w. L. STINSON ET AL INSULATOR Filed Aug. 6. 1931 2 Sheets-Sheet 2 attorney Patented Mar. 27, 1934 UNITED STATES PATENT OFFICE INSULATOR tion of West Virginia Application August 6, 1931, Serial No. 555,580

6 Claims.

This invention is a high tension insulator primarilydesigned for post-type functions, but not limited in this particular.

One of the objects of the invention is to provide an insulator of the character mentioned, so constructed that switches, or other electrical equipment mounted thereon cannot fall down from their positions in a substation, even though the porcelain body of the insulator should crack. A further object is to provide a posttype insulator of improved electrical and mechanical strength, having metal supporting members clamped to the dielectric body by means of bolts, and so arranged that said supporting plates are at all times maintained in relative position with the dielectric body irrespective of damage to said dielectric body. A further object is to provide means for eliminating the corona discharge between the metal parts and adjacent portions of the dielectric body of the insulator.

The invention will be hereinafter fully set forth and particularly pointed out in the claims.

In the accompanying drawings:

Figure 1 is a side elevation illustrating a post type insulator constructed in accordance with the invention. Figures 2 and 3 are top and bottom plan views respectively. Figure 4 is a cross sectional view on the line 44, Figure 2. Figure 5 is a cross sectional View on the line 55, Figure 2.

Referring to the drawings, 10 designates a dielectric body of any suitable material, preferably of porcelain, provided with oppositely disposed hub members 11 and 12 respectively, which for purposes of illustration are shown as of approximately hemispherical form. The hub portion 11 is provided with diametrically spaced recesses 13, and the hub portion 12 is also provided with similarly arranged recesses 14, which are also disposed diametrically opposite to each other, but in a line at right angles to the alinement of the recesses 13. The body portion 10 is preferably larger in diameter than the hub portions, and provided with petticoats.

The hub portion 11 is engaged by a complemental cap 15, which is preferably formed with an integral supporting flange or base plate 16 having recesses 17 therein which are complemental to and fit into the recesses 13 of the hub member. Said recesses 17 are provided with abutment members 18. In a similar manner the hub 12 is engaged by a complemental cap member 19 and base plate or flange 20, the cap being provided with recesses 21 complemental to the recesses 14 and also provided with abutment portions 22. By means of the engagement of the complemental recess portions 17 and 21 ot the caps and the recesses 13 and 14 of the hubs, an interlocking of the parts is obtained which resists forces tending to rotate the caps with respect to the hubs. Each flange 16 is provided with ears 23 by means of which adjoining caps of adjacent insulators may be secured together in a manner well understood in the art, and said plates may also be utilized as the bases or supporting means for a switch or other electrical fixtures of the type normally mounted upon a series of post-type insulators.

The insulator body is provided with two diametrically disposed arcuate bores 25 and 26 arranged at right angles to each other, and in crossed relation, as clearly appears from the drawings. Located within these bores are similarly contoured bolt members 27 and 28, the body portions of said bolt members being located within the dielectric body, and their ends projecting outwardly from the bores and through openings formed in the respective abutment plates 18 and 22. As shown, the ends of bolt 27 are threaded for engagement with nuts 29, by means of which the cap member 15 is firmly clamped over the hub portion 11, and securely anchored in this position. In a similar manner the cap "19 is secured by the bolt 28 over the hub portion 12.

Each of the base-plate portions 16 and 20 is provided with a central opening 30 through which a molten metal 31 such as an alloy of lead and antimony capable of being applied while in a molten condition, may be introduced into the space between the cap and the adjacent surface of the dielectric material. It will also be noted that the spaces between the caps and the hubs, when the caps are first positioned form conduits which lead from the openings 30 and communicate with the bores 25 and 26. Therefore, the molten metal will not only fill these spaces, but will at first flow through them and downwardly into the respective bores 25 and 26 and fill the spaces between the bolts 27 and 28 and the adjacent walls of the bores, as clearly shown. By this arrangement, the bolts and caps are not only firmly anchored in position with respect to the dielectric body, but all otherwise open space is solidly filled with the molten metal, so that the objectionable corona discharge from the metal parts is practically eliminated, thereby greatly improving the electrical strength of the device. If desired, the insulator body and the cap members may be provided with complemental recesses or grooves 32 to receive the molten metal and thereby provide a firmer-anchorage between the parts.

It will be observed that the device may be readily assembled and with little labor. For instance, the bolts and the bores therefor being arranged in true arcs, the bolts may be readily inserted from one end of each bore and. passed through until the both ends protrude an equal distance. Thereupon one of the caps is placed over its hub, and the abutment portions engaged with the projecting ends and the bolts 29, the nuts being engaged therewith and screwed home, thereby firmly clamping the cap to the insulator. The same process is followed with respect to both of the caps 13 and 19. After the caps have been clamped in position the molten metal may be readily applied through the openings 30, and upon cooling firmly unites the metal and dielectric parts.

The advantages of the invention will be readily understood by those skilled in the art to which it belongs. For instance, a particular advantage is gained by arranging the curved bolts in the form illustrated and in crossed relation, so that the cap members are firmly clamped to the porcelain body, thereby holding the parts together even though the porcelain should crack. By filling all of the interstices between the metal parts and the porcelain with a metallic filling, the corona is practically eliminated, thereby greatly improving the dielectrical strength of the insulator.

Having thus explained the nature of the invention and described an operative manner of constructing and using the same, although without attempting to set forth all of the forms in which it may be made, or all of the forms of its use, what is claimed is:

1. An insulator oi the character described comprising a dielectric body having oppositely extended approximately hemispherical hub members, similar cap members engaging the respective hub members, each cap member having a flange-like base constructed and arranged to be engaged by a similar base of another cap member, arcuate bolts passed through said dielectric body and arranged in crossed relation, and means connecting the ends of said bolts with the caps at positions located below the surfaces of the hubs and spaced from said flange-like bases.

2. An insulator of the character described comprising a dielectric body having oppositely extended approximately hemispherical hub members, said hub members having arcuate bores therein of approximately uniform diameter throughout and arranged in crossed relation and also having recesses leading inwardly from their surfaces and communicating with the ends of the respective bores, cap members engaging the respective hub members, bolts passed through and approximately filling said bores, and means connecting the ends of the bolts with the respective caps at positions within said recesses.

3. An insulator of the character described comprising a dielectric body having oppositely extended approximately hemispherical hub members, said hub members having arcuate bores therein arranged in crossed relation and also having recesses leading in from their surfaces and communicating with the ends of said bores, cap members engaging the respective hub members and also having recessed portions complemental to the recesses in the hub portions, bolts passed through said bores and projected into the recessed portions of said caps, and anchoring means within the recesses of said caps for engaging the ends of the bolts.

4. An insulator of the character described comprising a dielectric body having oppositely extended approximately hemispherical hub members, each hub member having oppositely disposed recesses leading in from the surface of the hub member, caps engaging said hub members, each cap having a flange-like base constructed and arranged to be engaged by a similar base of another cap member, each cap also having complemental recessed portions engaging the recesses of the hub members so as to prevent relative rotation of the caps and the hubmembers, arcuate bolts passed through said dielectric body and arranged in crossed relation, said bolts having their ends projected into the recessed portions of said caps and means within the recesses of said caps for engaging the ends of said bolts.

5. An insulator of the character described comprising a dielectric body having oppositely extended approximately hemispherical hub members, said hub members having arcuate bores therein of approximately uniform diameter throughout and arranged in crossed relation, cap members engaging the respective hub members and having abutment portions, arcuate bolts of less diameter than said bores, said bolts being passed through said bores and having their ends projected through said abutment portions, nuts engaging the ends of said bolts and cooperating with said abutment portions, and a metal filling the spaces between the bolts and the walls of the bores throughout the lengths of said bores and so closely engaging the bolts as to eliminate corona, said metal being capable of being placed within. said spaces while in a molten state.

6. An insulator of the character described comprising a dielectric body having oppositely extended approximately hemispherical hub members, said hub members having arcuate bores therein of approximately uniform diameter and arranged in crossed relation, cap members engaging the respective hub members, spaces being formed between the cap members and the surfaces of the hub member, said cap members having openings communicating with said spaces so that internal conduits are provided from said openings beneath the caps and into the bores, bolts of smaller diameter than said bores, said bolts being passed through said bores and engaged with said caps, and a metal filling the spaces between the bolts and the walls of the bores throughout the lengths of said bores and so closely engaging the bolts as to eliminate corona, said metal also filling the spaces between the cap members and the dielectric body so as to eliminate corona, said metal fillings being integrally connected, said metal being of a character capable of being poured into said spaces While in a molten state.

WILLIAM LOUIS STINSON. CHARLES L. STROUP. 

